Shuttle



Patented Apr. 16, 1929.

UNITED STATES ISAAC SNOW, OF LAWRENCE, MASSACHUSETTS.

SHUTTLE.

Application filed April 20, 1925. Serial No. 24,370.

This invention relates to self-threading shuttles.

In an automatic loom when the bobbin is shifted, at the first pick it is desirable that the yarn should automatically slip under a front hook and preferably also under a back hook or guide, and during the second pick should slip into the eye down in back of the horn and in front of the pin, and should stay there.

However at the beginning of the second pick, there is a period when the yarn is slack and there is a tendency to kink. During this period there is a tendency for the yarn to drop or slip out from under the front hook, and being kinked, to remain out during that pick, and to run over the top of the shuttle block.

When this happens, it is desirable to have a-stop or guard to prevent the yarn from slipping way back to the bobbin for if that happens the yarn must break.

I prefer to use for this stop, a back hook so shaped that it allows the yarn to slip down over its outside to its inner side and with a long end which extends along parallel with and close to a thread rest as this makes a relatively large mouth or pocket to catch the escaped yarn.

The very shape of the back hook however makes it possible for a loop of yarn to be thrown forward from the bobbin and to slip under and past the back hook and to get tangled up at the front. In such case, to catch the yarn, I use a front hook which extends down and back along parallel with and close to the thread rest forming a mouth or pocket to catch any such loop.

At the same time, the guide plate or wall of the shuttle block of which both hooks are extensions must extend over and down into the thread recess in the direction of the path of the unwinding yarn so that the tendency is always for the yarn to thread and re-thread.

In the drawings, Fig. l is a plan view of a shuttle with my improvement.

Fig. 2 is an elevation as from the top of Fig. 1 of the shuttle block removed from the shuttle. 7 i

Fig. 3 is a front view of the shuttle block removed from 'the shuttle.

Fig. 4 is a back viewof Fig. 3.

Fig. 5 is an elevation of the opposite side from Fig. 2.

Fig. 6 is a bottom view of the shuttle block.

Fig. 7 is a side elevation similar to Fig. 2 of .a modified form of shuttle block.

ber which extends forward in continuation.

of bobbin chamber 10, and 13 is the delivery passage which extends still further forward from the threading chamber.

I-I represents the shuttle eye in the wood, and this connects with the threading chamber 12 through the slot 15 cut away from the delivery passage 13. 8 represents the metal tip of the shuttle.

This eye H is what is known as a left eye,

as it is at the left when looking towards the tip 8 of the shuttle.

F represents a metallic threading block which is set into a recess 4 in the wood of the shuttle and is shown as fixed therein by means of a screw 36 which passes through a hole in the wood of the shuttle and a hole 35 in the block, in a well known manner. Preferably there is also at the bottom of block F, the projection 34 which fits into a recessin the wood of the shuttle.

32 is the horn and 33 the thread pin, both of well known form. Y

My improvement is more particularly useful in connection with a certain type of threading block in which there is a thread directing guide plate G which extends from the top thereof and from the top side of the shuttle, down and out at 22 into the threading chamber 12, or that part of the threading chamber which is enclosed in the threading block itself indicated at 9 inFig. 1.

In Figs. 1 to 5, there is at or near the back a thread retaining guide hook or member 28 which is in extension of the sloping part 22 of guide plate G. As this together with the part 22 of guide plate G extends'in the same direction and proximate the normal unwinding path of-the thread as it unwinds on the first pick of the shuttle in a magazine loom, that is in the direction of the arrow in Fig. 4, it is clear that it will slip into the part 9 of the threading chamber 12.

This is provided that the axis of the bobbin B somewhere nearly coincides with the bottom or axis of the passage 9 as should be the case and as shuttles are ordinarily constructed.

the unwinding thread Will travel around in the direction of the arrow as it unwinds from the bobbin, and there Will be very little likelihood of its unthreading even if the? is no overlap locking device such as shown in certain other patents.

The guide plate or guinle Wall G which is shown as being part of or starting at the top of shuttle block F, extends down in passage 9 as part; of the outside edgeof back hook 2-8 and of front hook l6. These hooks are in extension thereof.

I prefer toform on the other side of nassage 9-, that is the sirle opposite eye H, a thread rest 40-, which preferably slop-es down from the front end ll to the back end 42.

I prefer to make the tip 27 of the back hook 28 relatively long and parallel With and close to the top of thread rest 4-0, and the same way to extend the tip 17 of front hook 16, parallel with and close to this top wall so that in each there will be a very narrow passagefor the thread to pass through.

As shown by the dotted line B, if the yarn escapes from the front it will be caught on the front side of hook 28' until on the next pick it will slide clownaround front 300k 16 and re-thread".

On the other hand if the yarn- A, instead of traveling in its natural course, should Balloon or be thrown forward ina loop as shown by the dotted lineT in Fig. I, this loop will inevitably be caught by the front hook 16 and kept in place so that as soon it is pulled by the movement of the shuttle, it will slide back into its proper position.

Wall 5 of blocl't recess 4 is preferably substantially vertical.

5'0 is a recess for a piece of felt or other friction device.

The front end 4% of thread rest 4%0 preferably curves" a-round close to and under the long flat tip I? of front hook 16 and the enter edge of tip 17 preferably slants from the front to the back towards eye H.

In Fig. 7, I show one Way of making front and back hooks which may be used toadvantags.

represents the guide wall of the shuttle block which extends down and over into the shuttle block recess, and Sl is the front hook in extension thereof, while 83- is the back hook. These can conveniently be formed by casting, and then by boring out the metal as shown by the dotted circles, so as to form parts and 83 into suitable hooks. The tips of these hooks, such as 8%; and 8%, can then be pointed.

The thread rest 85 slopes from the front 82 down to the back 8 and should be close to but not extending up between the front and the back hooks. V

In Figs. 9 and I0, I show another modification, and also another Way in which the front and hack hooks can be formed. rep resents the guide Wall and' 93 the front hook, and 94 the hack hook, while 91 represents the thread rest.

in this case the front and. back hooks 93 and 94 may be cast in the form shown by the dotted lines, and then bent in to the full line pot "on inside thread rest 91. The tip and 0.. root ho: 93 is slightly above and inside the thread; 12st While-theend 95 of bark hook 94 inside and below the thread rest 91, which as shown extends down at a slant so as to form a sort of open mouth to receive the yarn as it slips in.

I also prefer use a cylindrical piece of felt QQWhich passes through a: hole 97 between the front and back hooks.

in Fi 9 and 10, the thread res aronnd at the frontas at 43, but is 1 claim:

1. The combination in an automatically tlireading shut e-having in one side an eye in the Wood, a shuttle block recess having a substantially" ver isle Wallopposite-said eye,

t isnot bent straight.

a ul rez'ei'ving slot which extends forwardly from said recess, and a passage con-- necting the eye with the recess; of a shuttle hloci: fastened in said recess having at the topa guide wall which extends downintothe re cess away from the eye, and is formed at the front With a flatfront hook which extends down in towards the axis of the shuttle and back, and at the back with a flatback hook which extends tl'OWI'l and forward, both in e-X- tension of'the guide Wall, said front hook and said back hook serving as the sole thread retainers for preventing the escapeof'thethread from the thread chamber through tho thread entrance to the threading chamber; and said thread rest which extends up in the recess oppositethe eye along the vertical Wall and which slopes around therefrom towards the eye, down from the front to the back parallel with and just below the front hook and below the back hook.

2. The combination in an automatically threading shuttle having on one side air eyein the Wood, a sh-i 'tl'e block recess having a sub sta-n tial'lyvertit al side Wall opposite said eye, a thread receivingsl ot which extends forward-- ly from said recess, and a passage connecting the eye Withthe recess; of a sl n-ittl'e block fastened in said recess having at the top a guide Wall which extends down into the recess away from the eye, and is formed at thefrontwith a front hook whichextends iIr towards the axis of the shuttle and back, andat the back with a back hook which extends down and forward, both in extension of the guide wall; said front hook and said back hook serving as the sole thread retainers for preventing the escape of the thread from the thread chamber throiigh thread entrance to the threading chamber.

3. The combination in an automatically threading shuttle having in one side an eye in the wood, a shuttle block recess having a substantially vertical side wall opposite said eye, a thread receiving slot which extends forwardly from said recess, and a passage connecting the eye with the recess; of a shuttle block fastened in said recess having at the top a guide wall which extends down into the recess away from the eye, and is formed at the front with a flat front hook which extends down and back, and at the back with a flat back hook which extends down and forward, both in extension of the guide wall, said front hook and said back hook serving as the sole thread retainers for preventing the escape of the thread from the thread chamber through the thread entrance to the threading chamher; and said thread rest which extends up in the recess opposite the eye along the vertical wall from a point proximate the back hook up and forward under the front hook and thence towards the shuttle eye.

t. The combination in an automatically threading shuttle having in one side an eye in the wood, a shuttle block recess having a substantially vertical side wall opposite said eye, a thread receiving slot which extends forwardly from said recess, and a passage connecting the eye with the recess; of a shuttle block fastened in said recess having at the top a guide wall which extends down into the recess away from the eye and is formed at the front with a nose which extends sharply downward and is extended around forming a bend at the front and bottom and thence back, into a flat front hook which extends down, in towards the axis of the shuttle and back, and is formed at the back with a flat back hook which extends down, and at its outer side in towards the axis of the shuttle and forward, both in extension of the guide wall, said front hook and said back hook serving as the sole thread retainers for preventing the escape of the thread from the thread chamber through the thread entrance to the threading chamber; and said thread rest which extends up in the recess opposite the eye along the vertical wall from a point proximate the back hook up and forward close to and under the hack hook up to a point between the back tip and the bend at the front of the front hook and thence towards the shuttle eye.

ISAAC SNOW. 

